Name__________KEY_____________

VS 117: Oculomotor Functions and Neurology

Spring 2000

(4 points) List the 4 Maddox components of vergence.

(4 points) A person who has a 5.5cm interpupillary distance views a target at 33cm. What is the stimulus (demand) to convergence in

a) Meter Angles = 3.0 MA

b) Prism Diopters = 16.5 prism diopters

 

(2 points) A person views a near target that has a convergence demand of 30 prism diopters. With one eye occluded the convergence of the eyes is 25 prism diopters. Under these conditions, what is the personís phoria?

(4 points) A person with a 6 cm PD has a near phoria of 5 exo and a far phoria of 5 eso. If the near phoria is tested at 40 cm, what is the calculated AC/A ratio?

(4 points) A person with a 6 cm PD has a near phoria without added lenses of 5 exo and the near phoria becomes 5 eso when the patient views the same near target through a minus 2D lens. What is the gradient AC/A ratio?

(4 points) Define convergence accommodation.